Question

A pipe can fill an empty tank in 5 h and there is an
emptying pipe which can empty the full tank in 7 h.
If both the pipes are kept open simultaneously,
then in how many hours will the tank be filled?​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

1/5-1/7=7/35-5/35=2/35

=35/2=17.5